tv vertical deflection problem MAGNUM PT2 chassis

B

b

Guest
Should have been an easy repair, this.
TV is a mid 90s MAGNUM 5520 VT, PT2 CHASSIS . A supermarket (german
Aldi) special I believe.
It came to me a couple of years ago with sound but no picture.
Increasing g2 gave thin horizontal line, frame collapse.

changed the IC, a new TDA 3653B (which is now fitted.)
checked/replaced all the components in the supply to the frame chip
(TDA 3653B). +26V rock solid on pin 6 and 9.

(FYI;: frame chip data: http://www.datasheetcatalog.com/datasheets_pdf/T/D/A/3/TDA3653B.shtml
TV PT2 schematic : http://www.eserviceinfo.com/downloadsm/41457/_Magnum.html
)

the problem is still the same. checked key resistors near IC, all in
spec.
now , question is how to check for vertical impulses without a scope.
It could also be the new IC was duff, but will pursue other avenues
first. I am also beginning to think that last time I opned this et 2
yrs or more ago, I may have put in a TDA 3653B in place of a TDA 3653
- not sure what was originally there and I may have got paranoid, not
sure how critical this is anyway.
In any case, the tv schematic and the TDA 3653B do not seem to tally
too closely re: pinouts.

would appreciate any ideas.
reards, B
 
On Sep 4, 12:57 pm, b <reverend_rog...@yahoo.com> wrote:
Should have been an easy repair, this.
TV is a mid 90s MAGNUM 5520 VT,  PT2 CHASSIS . A supermarket (german
Aldi) special I believe.
It came to me a couple of years ago with sound but no picture.
Increasing g2 gave thin horizontal line, frame collapse.

changed the IC,  a new TDA 3653B (which is now fitted.)
checked/replaced all the components in the supply to the frame chip
(TDA 3653B). +26V rock solid on pin 6 and 9.

(FYI;: frame chip data:http://www.datasheetcatalog.com/datasheets_pdf/T/D/A/3/TDA3653B.shtml
TV PT2 schematic :http://www.eserviceinfo.com/downloadsm/41457/_Magnum.html
)

the problem is still the same. checked key resistors near IC, all in
spec.
now , question is how to check for vertical impulses without a scope.
It could also be the new IC was duff, but will pursue other avenues
first. I am also beginning to think that last time I opned this et 2
yrs or more ago,  I may have put in a TDA 3653B in place of a TDA 3653
- not sure what was originally there and I may have got paranoid, not
sure how critical this is anyway.
 In any case, the tv schematic and the TDA 3653B do not seem to tally
too closely re: pinouts.

would appreciate any ideas.
reards, B
Click to expand...
borrow a scope!
 
On Sun, 4 Sep 2011 10:57:44 -0700 (PDT), b <reverend_rogers@yahoo.com>
wrote:

Should have been an easy repair, this.
TV is a mid 90s MAGNUM 5520 VT, PT2 CHASSIS . A supermarket (german
Aldi) special I believe.
It came to me a couple of years ago with sound but no picture.
Increasing g2 gave thin horizontal line, frame collapse.

changed the IC, a new TDA 3653B (which is now fitted.)
checked/replaced all the components in the supply to the frame chip
(TDA 3653B). +26V rock solid on pin 6 and 9.

(FYI;: frame chip data: http://www.datasheetcatalog.com/datasheets_pdf/T/D/A/3/TDA3653B.shtml
TV PT2 schematic : http://www.eserviceinfo.com/downloadsm/41457/_Magnum.html
)

the problem is still the same. checked key resistors near IC, all in
spec.
now , question is how to check for vertical impulses without a scope.
It could also be the new IC was duff, but will pursue other avenues
first. I am also beginning to think that last time I opned this et 2
yrs or more ago, I may have put in a TDA 3653B in place of a TDA 3653
- not sure what was originally there and I may have got paranoid, not
sure how critical this is anyway.
In any case, the tv schematic and the TDA 3653B do not seem to tally
too closely re: pinouts.

would appreciate any ideas.
reards, B
Click to expand...

Check or replace electrolytic capacitors in the vertical circuit.
Chuck
 
Bad joint going to the yoke ?

"b" wrote in message
news:064ceb80-aa5b-4959-bb6a-d750b35fab70@m18g2000vbe.googlegroups.com...

Should have been an easy repair, this.
TV is a mid 90s MAGNUM 5520 VT, PT2 CHASSIS . A supermarket (german
Aldi) special I believe.
It came to me a couple of years ago with sound but no picture.
Increasing g2 gave thin horizontal line, frame collapse.

changed the IC, a new TDA 3653B (which is now fitted.)
checked/replaced all the components in the supply to the frame chip
(TDA 3653B). +26V rock solid on pin 6 and 9.

(FYI;: frame chip data:
http://www.datasheetcatalog.com/datasheets_pdf/T/D/A/3/TDA3653B.shtml
TV PT2 schematic : http://www.eserviceinfo.com/downloadsm/41457/_Magnum.html
)

the problem is still the same. checked key resistors near IC, all in
spec.
now , question is how to check for vertical impulses without a scope.
It could also be the new IC was duff, but will pursue other avenues
first. I am also beginning to think that last time I opned this et 2
yrs or more ago, I may have put in a TDA 3653B in place of a TDA 3653
- not sure what was originally there and I may have got paranoid, not
sure how critical this is anyway.
In any case, the tv schematic and the TDA 3653B do not seem to tally
too closely re: pinouts.

would appreciate any ideas.
reards, B
 
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